Diplazium striatum (L.) C.Presl
Descripción
Rhizomes erect; rhizome scales dark brown, lustrous, somewhat retiform, linear-lanceolate, 10–15 X 2–3 mm, cell walls sinuous; fronds 100–160 cm long; stipes dark brown at bases, stramineous distally, 30–65 cm X 5–9 mm, 1⁄2–3⁄5 the frond length, with abundant, minute, erect, pale hairs ca. 0.1 mm long in the adaxial grooves; blades herbaceous, pinnate-pinnatifid proximally, or sometimes barely 2-pinnate, 35–100 X 25–50 cm, apices pinnatifid, buds absent; rachises glabrescent or moderately hairy; pinnae stalked 2–7 mm, equilateral, ca. 15–22 pairs per blade, 7–30 X 3–9 cm, oblong-lanceolate, proximal several pinna pairs sometimes with a few free or nearly free pinnules at bases, oblonglanceolate, cut usually 3⁄5–4⁄5(–9⁄10) the way to the costae, bases truncate, apices acuminate, pinnules or lobes 1.5–4 X 0.7–1.5 cm, slightly larger on sterile fronds, ca. 12–18 pairs per pinna, 1 or 2 proximal ones shortened, largest proximal ones broadly to narrowly adnate, distal ones broadly adnate and usually confluent, the largest pinnules lobed to 1⁄3 their width at their bases, otherwise merely crenate, spreading, obtuse at the tips; veins free, pinnate, 8–12 pairs per lobe, 1(–2)-forked; indument adaxially of abundant hairs in rachial and costal grooves, abaxially with a few scales on rachises and costae, also with hairs especially abundant on costae and costules but scattered to often dense between veins as well, hairs erect, 0.1–0.3 mm long, the longest ones septate; sori pinnate, 3–8 pairs per segment, with subentire indusia 2–8 X 0.3–0.6 mm; 2n=328 (Jam).A
Ejemplar revisado
Chis (Breedlove 31343, DS, NY; Purpus 6736, UC, US). Gro (Croat 45808, 45808A, MO). Oax (Hernández G. 1546, CHAPA; Mickel 4750, ENCB, NY, UC, 5232, NY, UC). Pue (Riba et al. 319, NY; Vera Santos 3326, ENCB). Ver (Smith 2005, UC; Ventura A. 1096, ENCB, NY). Tab (Linden 1491, FI–photo US!, K).
Unverified, Doubtful, or Mistaken Reports. Hgo (reported by Mickel & Beitel, 1988, and Palacios-Rios, 1992, but not verified). Qro (Rzedowski 43300, IEB, cited by Arreguín et al., 2001, but this specimen is D. striatastrum).
A
Unverified, Doubtful, or Mistaken Reports. Hgo (reported by Mickel & Beitel, 1988, and Palacios-Rios, 1992, but not verified). Qro (Rzedowski 43300, IEB, cited by Arreguín et al., 2001, but this specimen is D. striatastrum).
A
Elevación
150 – 2000 mA
Tipo de vegetación
Selva alta, Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Diplazium striatum differs from D. urticifolium in having hairs on the laminae and rachises abaxially, minute hairs in the grooves of costae and rachises adaxially, and pinnae cut 3⁄4 or more of the distance to costae. Occasional specimens of D. striatum appear glabrous abaxially, e.g., Palacios-Rios 3324 (XAL).
Diplazium striatastrum (q.v.), with laminar and rachis hairs like D. striatum, was segregated from D. striatum on the basis of several characters. In D. striatum, the proximal pinnae are fully pinnate at their bases with 1–2 free pinnules, whereas in D. striatastrum the proximal pinnae resemble the middle pinnae, being pinnatifid with adnate basal segments. The size differences given in the key also serve to separate the two species, but there is some overlap. More work is needed to determine the degree of relationship of D. striatastrum to D. striatum. It is tempting to speculate that D. striatum may have arisen following hybridization of D. striatastrum and D. expansum, because of its somewhat intermediate morphology.
Diplazium matudae was compared to D. biolleyi Christ, from Costa Rica, by Adams (1992), but that species has ovate costal scales and fully 2-pinnate-pinnatifid blades. Diplazium biolleyi seems not closely related to D. striatum, but may be the same as D. marattiifolium Christ. We find no significant differences between type and paratype material of D. matudae and typical D. striatum.
A
Diplazium striatastrum (q.v.), with laminar and rachis hairs like D. striatum, was segregated from D. striatum on the basis of several characters. In D. striatum, the proximal pinnae are fully pinnate at their bases with 1–2 free pinnules, whereas in D. striatastrum the proximal pinnae resemble the middle pinnae, being pinnatifid with adnate basal segments. The size differences given in the key also serve to separate the two species, but there is some overlap. More work is needed to determine the degree of relationship of D. striatastrum to D. striatum. It is tempting to speculate that D. striatum may have arisen following hybridization of D. striatastrum and D. expansum, because of its somewhat intermediate morphology.
Diplazium matudae was compared to D. biolleyi Christ, from Costa Rica, by Adams (1992), but that species has ovate costal scales and fully 2-pinnate-pinnatifid blades. Diplazium biolleyi seems not closely related to D. striatum, but may be the same as D. marattiifolium Christ. We find no significant differences between type and paratype material of D. matudae and typical D. striatum.
A